Single-provider dependency
Your entire team stops working when GitHub, GitLab, or Bitbucket has an outage. CI breaks, deploys stop, reviews halt, onboarding freezes. Every minute of downtime is multiplied across every engineer on your payroll.
Real-time mirror on a second provider
When one provider is down, work continues from the mirror — with zero manual switching effort. Your CI can target the mirror URL. Devs can clone from the backup. Recovery is not a fire drill; it is a config change you made in advance.